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gatsby-node.js
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gatsby-node.js
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const _ = require('lodash')
const path = require('path')
const pathPrefix = require('./config').pathPrefix
const createPaginatedPages = require('gatsby-paginate')
exports.onCreateNode = ({ node, actions, getNode }) => {
const { createNodeField } = actions
let slug
if (node.internal.type === `MarkdownRemark`) {
const fileNode = getNode(node.parent)
const parsedFilePath = path.parse(fileNode.relativePath)
if (
Object.prototype.hasOwnProperty.call(node, 'frontmatter') &&
Object.prototype.hasOwnProperty.call(node.frontmatter, 'title')
) {
slug = `/${_.kebabCase(node.frontmatter.title)}`
} else if (parsedFilePath.name !== 'index' && parsedFilePath.dir !== '') {
slug = `/${parsedFilePath.dir}/${parsedFilePath.name}/`
} else if (parsedFilePath.dir === '') {
slug = `/${parsedFilePath.name}/`
} else {
slug = `/${parsedFilePath.dir}/`
}
if (Object.prototype.hasOwnProperty.call(node, 'frontmatter')) {
if (Object.prototype.hasOwnProperty.call(node.frontmatter, 'slug') && Object.prototype.hasOwnProperty.call(node.frontmatter, 'cover')) { slug = `/blog/${_.kebabCase(node.frontmatter.slug)}` } else if (Object.prototype.hasOwnProperty.call(node.frontmatter, 'slug')) {
slug = `/${_.kebabCase(node.frontmatter.slug)}`
}
}
createNodeField({
name: `slug`,
node,
value: slug,
})
}
}
exports.createPages = ({ actions, graphql }) => {
const { createPage } = actions
return graphql(`{
allMarkdownRemark(sort: {order: DESC, fields: [frontmatter___date]}) {
edges {
node {
excerpt(pruneLength: 250)
id
fields {
slug
}
frontmatter {
cover {
childImageSharp {
gatsbyImageData(
quality: 72
placeholder: BLURRED
layout: FULL_WIDTH
)
}
publicURL
}
title
author
tags
date(formatString: "MMMM DD, YYYY")
templateKey
}
}
}
}
}
`).then(result => {
if (result.errors) {
result.errors.forEach(e => console.error(e.toString()))
return Promise.reject(result.errors)
}
const allNodes = result.data.allMarkdownRemark.edges
// Post pages:
let posts = []
// Iterate through each post/page, putting all found posts (where templateKey = article-page) into `posts`
allNodes.forEach(edge => {
if (_.isMatch(edge.node.frontmatter, { templateKey: 'article-page' })) {
posts = posts.concat(edge)
}
})
createPaginatedPages({
edges: posts,
createPage: createPage,
pageTemplate: 'src/templates/home-page.js',
pageLength: 6, // This is optional and defaults to 10 if not used
pathPrefix: pathPrefix, // This is optional and defaults to an empty string if not used
context: {}, // This is optional and defaults to an empty object if not used
})
allNodes.forEach((edge, index) => {
const id = edge.node.id
const nextID = index + 1 < allNodes.length ? index + 1 : 0
const prevID = index - 1 >= 0 ? index - 1 : allNodes.length - 1
const nextEdge = allNodes[nextID]
const prevEdge = allNodes[prevID]
createPage({
path: edge.node.fields.slug,
tags: edge.node.frontmatter.tags,
component: path.resolve(
`src/templates/${String(edge.node.frontmatter.templateKey)}.js`,
),
// additional data can be passed via context
context: {
id: id,
slug: edge.node.fields.slug,
nexttitle: nextEdge.node.frontmatter.title,
nextslug: nextEdge.node.fields.slug,
prevtitle: prevEdge.node.frontmatter.title,
prevslug: prevEdge.node.fields.slug,
},
})
})
// Tag pages:
let tags = []
// Iterate through each post, putting all found tags into `tags`
posts.forEach(edge => {
if (_.get(edge, `node.frontmatter.tags`)) {
tags = tags.concat(edge.node.frontmatter.tags)
}
})
// Eliminate duplicate tags
tags = _.uniq(tags)
// Make tag pages
tags.forEach(tag => {
const tagPath = `/tags/${_.kebabCase(tag)}/`
createPage({
path: tagPath,
component: path.resolve(`src/templates/tags.js`),
context: {
tag,
},
})
})
})
}